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Add rudimentary LSC tables for imx219. These were generated with the
rkisp1 tuning script from libtuning [1], using an imx8mp (debix) and a white
computer monitor, at only a single color temperature of 5800.
[1] https://lists.libcamera.org/pipermail/libcamera-devel/2022-October/035017.html
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Add coefficients sets in the YAML tuning file to allow using different set
depending of the image color temperature (provided by AWB algorithm).
During processing, LSC algorithm computes coefficients by doing a linear
interpolation between the two closer set.
Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The limits for the shutter speed and analogue gain are stored in
IPASessionConfiguration::agc. While they're related to the AGC, they are
properties of the sensor, and are stored in the session configuration by
the IPA module, not the AGC algorithm. Move them to the
IPASessionConfiguration::sensor structure where they belong.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Reorder functions in the base ipa::Algorithm and its derived classes to
match the calling order: queueRequest(), prepare() and process(). This
makes the code flow easier to read. No functional change intended.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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LSC gradient parameters are currently computed during prepare() phase.
Because these parameters can be computed only one time and stay constant for
each frame after, move the computation to the configure() function.
Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
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Previously we only did this when the system starts (on the first
switch_mode). Now we do it whenever the manual colour gains are
updated. To facilitate this, this R/B vs. colour temperature inverse
functions are stored persistently in the AwbConfig.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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pwl.cpp uses abs() instead of std::abs(), which causes unexpected
behavior in the Clang compiler used for Android. Replace with
C++-standard absolute value function std::abs(), which supports
double-precision absolute values in a standard way.
Signed-off-by: Nicholas Roth <nicholas@rothemail.net>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The raspberrypi IPA is missing thread-safety annotations, which breaks
the build.
Add required thread-safety annotations.
../src/ipa/raspberrypi/controller/metadata.h:108:31: error: mutex
'mutex_' is still held at the end of function [-Werror,-Wthread-safety-analysis]
void lock() { mutex_.lock(); }
^
../src/ipa/raspberrypi/controller/metadata.h:108:23: note: mutex
acquired here
void lock() { mutex_.lock(); }
^
../src/ipa/raspberrypi/controller/metadata.h:109:25: error: releasing
mutex 'mutex_' that was not held [-Werror,-Wthread-safety-analysis]
void unlock() { mutex_.unlock(); }
^
Signed-off-by: Nicholas Roth <nicholas@rothemail.net>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Fill the frame metadata in the AGC and AWB algorithm's prepare()
function. This removes the need to fill metadata manually in the IPA
module's processStatsBuffer() function.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Fill the frame metadata in the AGC and AWB algorithm's prepare()
function. Additional metadata for other algorithms will be addressed
later.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Extend the Algorithm::process() function with a metadata control list,
to be filled by individual algorithms with frame metadata. Update the
rkisp1 and ipu3 IPA modules accordingly, and drop the dead code in the
IPARkISP1::prepareMetadata() function while at it.
This only creates the infrastructure, filling metadata in individual
algorithms will be handled separately.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The recent change to the naming scheme for the camera tuning files failed to
rename ov9281.json, causing the sensor to fail to load. Since this is a mono
sensor module, rename this file to ov9281_mono.json.
Fixes: 820607b195ff: ("pipeline: raspberrypi: Update naming convention for tuning files")
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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There's no need to print the exposure and gain control ranges as an Info
message. Downgrade it to Debug. While at it, print the ranges using the
"[min, max]" syntax.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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A few periods crept in at the end of Doxygen \brief or \param statements
in the src/ipa/ directory. Remove them all in one go.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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For the purpose of testing serializing/deserializing Flags in function
parameters, add an enum class TestFlags and Flags<TestFlags> to some
function parameters, both for input and output and Signals.
While at it, update the ipa_interface_test.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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For the purpose of testing serializing/deserializing enums in function
parameters, add IPAOperationCode to the parameter list of init().
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Update the imx219, imx477 and imx519 parsers to extract the line length
values from the embedded data stream and use these values in the
deviceStatus metadata, replacing the DelayedControls provided values.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Rename CamHelper::getVBlanking to CamHelper::getBlanking, and update the
calculations in that function to return both horizontal and vertical
blanking values for a given exposure time and frame duration limits. The
calculations are setup such that vertical blanking is extended to the
maximum allowable value, and any remainder gets put into horizontal
blanking.
The calculated horizontal blanking value is now returned to the pipeline
handler to pass into DelayedControls to program into the sensor.
Update the IPA to now specify the maximum frame duration from the
maximum horizontal + vertical blanking values provided by the sensor
mode. Additionally, the IPA now uses the frame specific horizontal
blanking value (as returned by DelayedControls) in all instances.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add a lineLength field to the DeviceStatus structure to store the line
length used for a particular frame.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add CamHelper::hblankToLineLength() to calculate the line length
duration from the horizontal blanking (in pixels) value.
Add CamHelper::lineLengthToHblank() to calculate the horizontal blanking
(in pixels) value from the line length duration.
Add CamHelper::lineLengthPckToDuration() to calculate the line length
duration from the line length in pixels.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The pixel clock rate will be used in subsequent commits to calculate
line length durations.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Update CamHelper::getDelays() to return the sensor HBLANK delay. The
HBLANK delay is set to the same value as VBLANK delay for all sensors in
the Raspberry Pi IPA.
Return the HBLANK gain delay from the IPA to the pipeline handler, and
initialise DelayedControls to handle V4L2_CID_HBLANK with this delay
value.
As a drive-by, check that the V4L2_CID_HBLANK control is available when
calling IPARPi::configure().
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Given that the single user of the CamHelper is the Raspberry Pi IPA, the
initialized_ field check is unnecessary. Remove the check and the field.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Update CamHelper::exposureLines() and CamHelper::exposure() to take a
line length duration parameter for use in the exposure calculations.
For now, only use the minimum line length for all the calculations to
match the existing IPA behavior.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add fields for minimum and maximum line length duration to the
CameraMode structure. This replaces the existing lineLength field.
Any use of the existing lineLength field is replaced by the new
minLineLength field, as logically we always want to use the fastest
sensor readout by default.
As a drive-by cosmetic change, split all fields in the CameraMode
structure into separate lines.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add fields for minimum and maximum line length (in units of pixels) to
the IPACameraSensorInfo structure. This replaces the existing lineLength
field.
Update the ipu3, raspberrypi and rkisp1 IPAs to use
IPACameraSensorInfo::minLineLength instead of
IPACameraSensorInfo::lineLength, as logically we will always want to use
the fastest sensor readout by default.
Since the IPAs now use minLineLength for their calculations, set the
starting value of the V4L2_CID_HBLANK control to its minimum in
CameraSensor::init().
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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utils::defopt causes compilation issues on gcc 8.0.0 to gcc 8.3.0,
likely due to bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86521
that was fixed in gcc 8.4.0. gcc 8.3.0 may be considered old (libcamera
requires gcc-8 or newer), but it is shipped by Debian 10 that has LTS
support until mid-2024.
As no workaround has been found to fix compilation on gcc 8.3.0 while
still retaining the functionality of utils::defopt, stop using it in the
RkISP1 IPA module.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Commit 09c1b081baa2 ("libcamera: controls: Generate and use fixed-sized
Span types") added explicit Span casts for fixed extent spans that were
required due to the ControlList::set() function that takes an
std::initializer_list not being able to infer a control size from
template arguments. This has now been fixed, so the casts are not needed
anymore. Drop them.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Christian Rauch <Rauch.Christian@gmx.de>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
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The REGISTER_CAMERA_SENSOR_HELPER() macro defines a class type that
inherits from the CameraSensorHelperFactory class, and implements a
constructor and createInstance() function. Replace the code generation
through macro with the C++ equivalent, a class template, as done by the
Algorithm factory.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Xavier Roumegue <xavier.roumegue@oss.nxp.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Avoid naked pointer with memory allocation by returning a unique_ptr
from CameraSensorHelperFactory::createInstance(), in order to increase
memory allocation safety.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Xavier Roumegue <xavier.roumegue@oss.nxp.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The CameraSensorHelperFactory registerType() and createInstance()
functions are called by the CameraSensorHelperFactory class only. Make
them private.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Xavier Roumegue <xavier.roumegue@oss.nxp.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The CameraSensorHelperFactory::createInstance() function has no need to
modify the factory instance. Make it const.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Xavier Roumegue <xavier.roumegue@oss.nxp.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The IPAFrameContext documentation has a spurious Doxygen \struct
statement that is not needed, and uses a \struct instead of a \var in
another location. Fix both issues. This doesn't cause any change in the
generated documentation.
Note that the Doxygen output for IPAFrameContext is incorrect,
documentation is missing for all members. This is caused by using "."
instead of "::" in our documentation, which we currently do because the
correct syntax produces Doxygen warnings (and still incorrect output).
See https://github.com/doxygen/doxygen/issues/9343.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The sensor black level is 60 (in 10-bits), fix this in the mono variant tuning
file.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add the tuning file (imx296.json) for the colour variant of the IMX296 sensor.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Append "_mono" to the sensor name when generating the tuning filename for
monochrome sensor variants. So the new naming convention is as follows:
<sensor_name>.json - Standard colour sensor variant
<sensor_name>_mono.json - Monochrome sensor variant
Rename the existing imx296.json file to imx296_mono.json as this tuning file
is based on the monochrome variant of the IMX296.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Limit the minimum allowable exposure time to a single line in the IMX296
camera helper. This equates to approximately 30us.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The IMX296 implements a 2 frame delay for exposure, gain and vertical
blanking changes. Report this in the camera helper.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The introduction of the FCQueue in the IPU3 inadvertently introduced a
bug which cleared the initialisation of the session configuration
immediately after some parameters had been set.
Furthermore, it cleared and never re-initialised the sensor line
duration property, which was previously only set during the call to
init().
Move the clearing of the contexts from the updateSessionConfiguration()
call to the earliest opportunity in configure(), and immediately
re-initialise the sensor parameters.
Bug: https://bugs.libcamera.org/show_bug.cgi?id=151
Fixes: 85c5c47325ab ("ipa: ipu3: Use the FCQueue")
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Multiple algorithms have an initialized_ flag that they set to true at
the end of the init() function, and check at the beginning of prepare()
to skip preparation. This serves no real purpose, as the flag can only
be false if init() fails, in which case the IPA module initialization as
a whole will fail.
Drop the initialized_ flags.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Two documentation files are missing SPDX headers. Add them, with the
CC-BY-SA-4.0 license that covers all the libcamera documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The red and blue gains are computed by dividing the green mean by the
red and blue means respectively. An offset of 1 is added to the dividers
to avoid divisions by zero. This introduces a bias in the gain values.
Fix it by clamping the divisors to a minimum of 1.0 instead of adding an
offset.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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When the RGB means are too small, gains and color temperature can't be
meaningfully calculated. Freeze the AWB in that case, using the
previously calculated values.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The gain values are currently clamped to the range [0.0, 3.996] used by
the hardware. A zero value makes little sense, as it would completely
remove the contribution of the corresponding color channel from the AWB
accumulators, but worse, would lead to divisions by zero when
calculating the raw means in subsequent iterations. Prevent this by
setting the minimum gain value to 1/256.
While at it, clamp the gain values before filtering them, to improve the
stability of the control loop.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Due to hardware rounding errors in the YCbCr means, the calculated RGB
means may be negative. This would lead to negative gains, messing up
calculation. Prevent this by clamping the means to positive values.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Extend the debug message in Awb::process() to log the means and color
temperature in addition to the gains. This is useful for debugging the
algorithm behaviour. While at it, set the showpoint flag to print a
fixed number of digits after the decimal point, making logs more
readable.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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RkISP actually supports two modes for color means, RGB and YCbCr. The
variables where the means are stored are identically named regardless of
the color means mode that's been selected.
Since the gains are computed in RGB mode, a conversion needs to be done
when the mode is YCbCr, which is unnecessary when RGB mode is selected.
This adds support for RGB means mode too, by checking at runtime which
mode is selected at a given time. The default is still set to YCbCr mode
for now.
Cc: Quentin Schulz <foss+libcamera@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The color temperature doesn't need floating point precision, and is
calculated by Awb::estimateCCT() as an unsigned integer. Store it with
the same data type in the frame context.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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The AWB statistics are computed after the ISP applies the colour gains.
This means that the red, green and blue means do not match the data
coming directly from the sensor, but are multiplied by the colour gains
that were used for the frame on which the statistics have been computed.
The AWB algorithm needs to take this into account when calculating the
colour gains for the next frame. Do so by dividing the means by the
gains that were applied to the frame, retrieved from the frame context.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Now that data used by algorithms has been partitioned between the active
state and frame context, we have a better view of the role of each of
those structures. Document them appropriately.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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